maestro
bass
brassmaster

I started with RG Keen's layout of
this circuit, and made a couple of minor changes.
First, I wanted to be
able to mount the pots directly to the PCB, as pictured
below. Second,
I wanted to wire the switching for the filter section as
in the
schematic (link above).

To my ears, this stock clone sounds good on both bass and
guitar.
However, the filter switch (Brass1/Brass2) doesn't seem to
have much
affect. Others who have done the wiring as in RG's layout
have reported
the same. It could likely be made more responsive by
simply adjusting
some of the component values (resistors) in the filter
network.